Leak from tile shower

[cb103]

So I have discovered a leak coming from somewhere around the tile shower, but just can’t pinpoint it. Water damage to the right corner just on the floor on inside of house. Under the house the water has came through approx 8” over to 22” from the drain or water supply. Cut a access hole and def no leak from the water supply. Doesn’t appear to have a leak when observing the drain under the house while the water is running either